CN112050274B - Cascade energy utilization heating system under low-load working condition and control method thereof - Google Patents
Cascade energy utilization heating system under low-load working condition and control method thereof Download PDFInfo
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- CN112050274B CN112050274B CN202010873224.9A CN202010873224A CN112050274B CN 112050274 B CN112050274 B CN 112050274B CN 202010873224 A CN202010873224 A CN 202010873224A CN 112050274 B CN112050274 B CN 112050274B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000010248 power generation Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
Abstract
The invention relates to a cascade energy utilization heating system under a low-load working condition and a control method thereof, wherein the cascade energy utilization heating system comprises a boiler, a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder, a first ejector, a second ejector, a first heat supply network heater and a second heat supply network heater; the boiler, the turbine high-pressure cylinder, the turbine medium-pressure cylinder and the turbine low-pressure cylinder are communicated through pipelines in sequence; the steam outlet of the middle pressure cylinder of the steam turbine is respectively communicated with the power steam inlet of the first ejector, the power steam inlet of the second ejector and the first heat supply network heater through pipelines; the exhaust port of the low-pressure cylinder of the steam turbine is communicated with the low-pressure steam inlet of the first ejector through a pipeline; the outlet of the first ejector is respectively communicated with the low-pressure steam inlet of the second ejector and the outlet of the second ejector through pipelines; the outlet of the first ejector and the outlet of the second ejector are also communicated with a second heat supply network heater through pipelines; the first heat supply network heater is communicated with the second heat supply network heater through a pipeline.
Description
Technical Field
The invention relates to a cascade energy utilization heating system under a low-load working condition and a control method thereof, belonging to the technical field of thermal power generation.
Background
With the development of national economy, the demand of society for electric power is continuously increasing. In the early stage, due to the lack of electricity in China, the main tasks of the generator set are full-scale power generation and stable power generation. With the development of electric power in China, the relationship between electricity consumption and power generation tends to be balanced, and even the situation of surplus power generation can occur.
In addition, the total heat efficiency of the heating season of the general cogeneration power plant can reach 60% -80%, and the annual heat efficiency is 50% -70%. For a non-cogeneration unit, the thermal efficiency of the medium-small extraction condensing unit or the pure condensing unit is only 25-40%. The actual thermal efficiency of the large-scale power plant is only 30% -40%, and a large amount of heat loss exists in the power plant, wherein more than 50% -60% of the heat loss is waste steam condensation heat loss. The temperature of the condensed exhaust steam is generally 20-40 ℃, belongs to low-grade heat energy, and is difficult to recycle.
The condensed exhaust steam belongs to exhaust steam waste heat for a thermal power generation steam turbine, but is a serious waste of energy for heating residents with low energy quality requirements. Meanwhile, exhaust steam is cooled by the condenser and then released into the atmosphere, so that the pollution of the air environment is easily caused.
Disclosure of Invention
In order to overcome the problems, the invention provides the cascade energy utilization heating system under the low-load working condition and the control method thereof, which can recycle the exhaust steam discharged by the steam turbine to be applied to central heating, can well solve the problem of shortage of heat sources in urban central heating, can also realize energy conservation and emission reduction of a thermal power plant, and improves the environment.
The technical scheme of the invention is as follows:
the cascade energy utilization heating system under the low-load working condition comprises a boiler, a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder, a first ejector, a second ejector, a first heat supply network heater and a second heat supply network heater; the boiler, the turbine high-pressure cylinder, the turbine medium-pressure cylinder and the turbine low-pressure cylinder are communicated through pipelines in sequence; the steam outlet of the middle pressure cylinder of the steam turbine is respectively communicated with the power steam inlet of the first ejector, the power steam inlet of the second ejector and the first heat supply network heater through pipelines; the steam outlet of the low-pressure cylinder of the steam turbine is communicated with the low-pressure steam inlet of the first ejector through a pipeline; the outlet of the first ejector is respectively communicated with the low-pressure steam inlet of the second ejector and the outlet of the second ejector through pipelines; the outlet of the first ejector and the outlet of the second ejector are also communicated with the second heat supply network heater through pipelines; the first heat supply network heater is communicated with the second heat supply network heater through a pipeline.
Further, a first steam valve is arranged on a pipeline, wherein a steam outlet of the middle pressure cylinder of the steam turbine is communicated with a power steam inlet of the first ejector; a second steam valve is arranged on a pipeline, wherein a steam outlet of the middle pressure cylinder of the steam turbine is communicated with a power steam inlet of the second ejector; and a third steam valve is arranged on a pipeline, communicated with the first heat supply network heater, of a steam discharge port of the middle pressure cylinder of the steam turbine.
Further, a first injection steam valve is arranged on a pipeline, wherein a steam outlet of the low-pressure cylinder of the steam turbine is communicated with a low-pressure steam inlet of the first ejector; and a second injection steam valve is arranged on a pipeline, wherein the outlet of the first ejector is communicated with the low-pressure steam inlet of the second ejector.
Further, a first mixed steam valve is arranged on a pipeline between a steam outlet of the first ejector and a pipeline between the outlet of the second ejector; and a second mixed steam valve is arranged on a pipeline, wherein the outlet of the second ejector is communicated with the second heat supply network heater.
Furthermore, a control method of the cascade energy utilization heating system under the low-load working condition comprises the following steps:
the first step: acquiring an outdoor environment temperature T0;
continuously monitoring the outdoor environment temperature T0 in winter;
and a second step of: presetting four temperature node parameters, wherein the temperature nodes T1 > T2 > T3 > T4;
according to different heat supply areas, four temperature nodes are arranged so as to adjust heat supply temperature in time when the outdoor environment temperature T0 changes, thereby achieving the heat supply requirement of heat users;
thirdly, comparing the outdoor environment temperature T0 with four temperature node parameters to determine a heating mode;
d1: when the outdoor environment temperature T0 is more than or equal to the temperature node T1, the heat supply mode is switched to a mode 1;
the mode 1 is to close a first steam valve, a second steam valve, a third steam valve, a first injection steam valve, a second injection steam valve, a first mixed steam valve and a second mixed steam valve, and simultaneously, close a first ejector and a second ejector;
d2: when the outdoor environment temperature T0 is more than or equal to the temperature node T2, the heat supply mode is switched to the mode 2;
the mode 2 is that a first steam valve, a first injection steam valve, a first mixed steam valve, a second mixed steam valve and a first ejector are opened, and a second steam valve, a third steam valve, a second injection steam valve and a second ejector are closed;
d3: when the outdoor environment temperature T0 is more than or equal to the temperature node T3, the heat supply mode is switched to a mode 3;
the mode 3 is that a first steam valve, a second steam valve, a first injection steam valve, a second mixed steam valve, a first ejector and a second ejector are opened, and a third steam valve and the first mixed steam valve are closed;
d4: when the outdoor ambient temperature T0 is less than or equal to the temperature node T4, the heat supply mode is switched to a mode 4;
the mode 4 is to open the first steam valve, the second steam valve, the third steam valve, the first injection steam valve, the second mixed steam valve, the first ejector and the second ejector and close the first mixed steam valve.
The invention has the following beneficial effects:
1. the invention recovers the exhaust steam exhausted by the steam turbine and applies the exhaust steam to central heating, thereby not only well solving the problem of shortage of heat sources in urban central heating, but also realizing energy conservation and emission reduction of a thermal power plant and improving the environment.
2. According to the invention, through the steam ejector, exhaust steam is ejected by utilizing the exhaust steam of the medium-pressure cylinder of the steam turbine, so that the water supply temperature of a heat supply network and the heat supply capacity of a power plant are improved, and the cascade utilization of energy sources is realized; in addition, the exhaust steam quantity can also meet the steam quantity for heat supply, and the problem of insufficient urban heat supply is solved.
3. The invention utilizes the exhaust steam, improves the recycling of low-grade heat energy, reduces the cold end loss, reduces the coal consumption and improves the economy of the power plant.
4. The ejector has a simple structure, does not have moving parts, can well adapt to thermal load or electric load, and is safe and stable; meanwhile, two ejectors are connected in series, so that the heat supply steam quantity can be flexibly adjusted according to the change of the ambient temperature, and the heat supply mode can be timely adjusted, thereby meeting the heat demand of heat users and not wasting energy.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a flowchart of a heating control method according to the present invention.
The reference numerals in the drawings are as follows:
1. a boiler; 2. a turbine high pressure cylinder; 3. a turbine intermediate pressure cylinder; 4. a low pressure cylinder of the steam turbine; 5. a first injector; 6. a second ejector; 7. a first heating network heater; 8. a second heating network heater; 9. a first steam valve; 10. a second steam valve; 11. a third steam valve; 12. a first injection steam valve; 13. a second injection steam valve; 14. a first mixed steam valve; 15. a second mixed steam valve.
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
Wherein the arrow direction indicates the flow direction; a represents a water supply system; b represents a heat supply network water supply system; c represents a heat supply network backwater system; d represents a regenerative system.
Referring to fig. 1-2, a cascade energy utilization heating system under low load conditions comprises a boiler 1, a turbine high pressure cylinder 2, a turbine medium pressure cylinder 3, a turbine low pressure cylinder 4, a first ejector 5, a second ejector 6, a first heat supply network heater 7 and a second heat supply network heater 8; the boiler 1, the turbine high-pressure cylinder 2, the turbine intermediate-pressure cylinder 3 and the turbine low-pressure cylinder 4 are communicated through pipelines in sequence; the steam outlet of the middle pressure cylinder 3 of the steam turbine is respectively communicated with the power steam inlet of the first ejector 5, the power steam inlet of the second ejector 6 and the first heat supply network heater 7 through pipelines; the steam outlet of the low-pressure cylinder 4 of the steam turbine is communicated with the low-pressure steam inlet of the first ejector 5 through a pipeline; the outlet of the first ejector 5 is respectively communicated with the low-pressure steam inlet of the second ejector 6 and the outlet of the second ejector 6 through pipelines; the outlet of the first ejector 5 and the outlet of the second ejector 6 are also communicated with the second heat supply network heater 8 through pipelines; the first heat supply network heater 7 is communicated with the second heat supply network heater 8 through a pipeline.
According to the above description, water is changed into steam after entering the boiler 1 from the water supply system a and flows through the turbine high pressure cylinder 2 and the turbine intermediate pressure cylinder 3 in sequence; then, at the steam outlet of the middle pressure cylinder 3 of the steam turbine, steam is divided into three parts, and enters the power steam inlet of the first ejector 5, the power steam inlet of the second ejector 6 and the first heat supply network heater 7 respectively; then, the steam discharged from the steam discharge port of the low-pressure cylinder 4 of the steam turbine enters the low-pressure steam inlet of the first ejector 5, and the steam discharged from the outlet of the first ejector 5 enters the low-pressure steam inlet of the second ejector 6 and the outlet of the second ejector 6 respectively; simultaneously, exhaust steam at the outlet of the first ejector 5 and exhaust steam at the outlet of the second ejector 6 enter the second heat supply network heater 8, and the first heat supply network heater 7 and the second heat supply network heater 8 are communicated with each other; finally, a part of steam in the first heat supply network heater 7 enters the heat supply network water supply system b, another part of steam flows back to the heat recovery system d, a part of steam in the second heat supply network heater 8 enters the heat supply network water return system c, and another part of steam flows back to the heat recovery system d.
The invention adopts two ejectors, wherein the first ejector 5 utilizes steam exhaust of the middle pressure cylinder 3 of the steam turbine to eject exhaust steam, and the second ejector 6 utilizes steam exhaust of the middle pressure cylinder 3 of the steam turbine to eject steam at the outlet of the first ejector 5. Thus, when the first ejector 5 is operated, the pressure of the heating steam is increased, and the return water temperature of the heating network is increased; when the first ejector 5 and the second ejector 6 are operated simultaneously, the pressure of steam discharged from the outlet of the second ejector 6 is greatly improved compared with the pressure of steam discharged when only the first ejector 5 is operated, so that the return water temperature of the heat supply network is further improved. Therefore, on one hand, the invention can improve the heat supply capacity of the power plant and solve the problem of insufficient urban heat supply; on the other hand, the jet exhaust steam is injected by the ejector, so that the cold end loss can be reduced, the steam utilization rate is improved, and the benefit of a power plant is improved.
Further, a first steam valve 9 is arranged on a pipeline, wherein a steam outlet of the middle pressure cylinder 3 of the steam turbine is communicated with a power steam inlet of the first ejector 5; a second steam valve 10 is arranged on a pipeline, wherein the steam outlet of the middle pressure cylinder 3 of the steam turbine is communicated with the power steam inlet of the second ejector 6; a third steam valve 11 is arranged on a pipeline, wherein the exhaust port of the middle pressure cylinder 3 of the steam turbine is communicated with the first heat supply network heater 7.
Further, a first injection steam valve 12 is arranged on a pipeline, wherein a steam outlet of the low-pressure cylinder 4 of the steam turbine is communicated with a low-pressure steam inlet of the first ejector 5; a second injection steam valve 13 is arranged on a pipeline of which the outlet of the first ejector 5 is communicated with the low-pressure steam inlet of the second ejector 6.
Further, a first mixed steam valve 14 is arranged on a pipeline between a steam outlet of the first ejector 5 and a pipeline between the outlet of the second ejector 6; a second mixed steam valve 15 is arranged on a pipeline of the outlet of the second ejector 6 communicated with the second heating network heater 8.
Furthermore, a control method of the cascade energy utilization heating system under the low-load working condition comprises the following steps:
the first step: acquiring an outdoor environment temperature T0;
continuously monitoring the outdoor environment temperature T0 in winter;
in winter, the indoor temperature of a heat user is generally required to reach about 18 ℃; while the outdoor ambient temperature T0 in winter tends to be constantly changing. Therefore, the outdoor environment temperature T0 needs to be monitored, so as to facilitate the subsequent preparation of different heat supply plans.
And a second step of: presetting four temperature node parameters, wherein the temperature nodes T1 > T2 > T3 > T4;
according to different heat supply areas, four temperature nodes are arranged so as to adjust heat supply temperature in time when the outdoor environment temperature T0 changes, thereby achieving the heat supply requirement of heat users;
the outdoor environment temperature T0 in winter is continuously changed, so if the indoor temperature is required to be kept within a certain temperature range, the heating temperature needs to be correspondingly adjusted according to the change of the outdoor environment temperature T0, otherwise, the heating requirement of a heat user cannot be met when the temperature is too low, and energy is wasted when the temperature is too high. In view of this, the present invention correspondingly designs four working condition modes for the four temperature node parameters T1, T2, T3 and T4, and can adjust the heating temperature in time when the outdoor environment temperature T0 changes.
Thirdly, comparing the outdoor environment temperature T0 with four temperature node parameters to determine a heating mode;
d1: when the outdoor environment temperature T0 is more than or equal to the temperature node T1, the heat supply mode is switched to a mode 1;
the mode 1 is to close the first steam valve 9, the second steam valve 10, the third steam valve 11, the first injection steam valve 12, the second injection steam valve 13, the first mixed steam valve 14 and the second mixed steam valve 15, and simultaneously close the first ejector 5 and the second ejector 6;
mode 1 is closing all steam valves; at the same time, both injectors are not involved in operation. When the mode 1 is adopted, heat does not need to be supplied to a heat user, and meanwhile, the waste of energy sources can be reduced.
D2: when the outdoor environment temperature T0 is more than or equal to the temperature node T2, the heat supply mode is switched to the mode 2;
the mode 2 is that the first steam valve 9, the first injection steam valve 12, the first mixed steam valve 14, the second mixed steam valve 15 and the first injector 5 are opened, and the second steam valve 10, the third steam valve 11, the second injection steam valve 13 and the second injector 6 are closed;
mode 2 is to put into operation only with the first injector 5 and simultaneously open the corresponding steam valve. When in the initial or final stage of heating, the heat consumer demand is small, so mode 2 is employed.
D3: when the outdoor environment temperature T0 is more than or equal to the temperature node T3, the heat supply mode is switched to a mode 3;
the mode 3 is that a first steam valve 9, a second steam valve 10, a first injection steam valve 12, a second injection steam valve 13, a second mixed steam valve 15, a first ejector 5 and a second ejector 6 are opened, and a third steam valve 11 and a first mixed steam valve 14 are closed;
the mode 3 is that the first ejector 5 and the second ejector 6 are both put into operation, and the corresponding steam valves are opened at the same time. As the ambient temperature decreases, the demand of the hot user increases, so mode 3 is employed.
D4: when the outdoor ambient temperature T0 is less than or equal to the temperature node T4, the heat supply mode is switched to a mode 4;
the mode 4 is to open the first steam valve 9, the second steam valve 10, the third steam valve 11, the first injection steam valve 12, the second injection steam valve 13, the second mixed steam valve 15, the first ejector 5 and the second ejector, and close the first mixed steam valve 14.
The mode 4 is to open all steam valves except the first mixed steam valve 14, and simultaneously the first ejector 5 and the second ejector 6 are put into operation, and the steam outlet of the middle pressure cylinder 3 of the steam turbine leads out one path to the first heat supply network heater 7 to directly participate in heat supply. As the cold period of the tip is stepped in, the heat supply demand of the heat user reaches the peak value, at the moment, the method of the mode 4 is adopted, and when the steam valve and the ejector are opened, one path of steam outlet of the middle pressure cylinder 3 of the steam turbine is led out to the first heat supply network heater 7 to directly participate in heat supply, so that the water supply temperature is further improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (1)
1. A control method of a cascade energy utilization heating system under a low-load working condition is characterized by comprising the following steps of: the system comprises a boiler (1), a turbine high-pressure cylinder (2), a turbine medium-pressure cylinder (3), a turbine low-pressure cylinder (4), a first ejector (5), a second ejector (6), a first heat supply network heater (7) and a second heat supply network heater (8); the boiler (1), the turbine high-pressure cylinder (2), the turbine medium-pressure cylinder (3) and the turbine low-pressure cylinder (4) are sequentially communicated through pipelines; the steam outlet of the middle pressure cylinder (3) of the steam turbine is respectively communicated with the power steam inlet of the first ejector (5), the power steam inlet of the second ejector (6) and the first heat supply network heater (7) through pipelines; the steam outlet of the low-pressure cylinder (4) of the steam turbine is communicated with the low-pressure steam inlet of the first ejector (5) through a pipeline; the outlet of the first ejector (5) is respectively communicated with the low-pressure steam inlet of the second ejector (6) and the outlet of the second ejector (6) through pipelines; the outlet of the first ejector (5) and the outlet of the second ejector (6) are also communicated with the second heat supply network heater (8) through pipelines; the first heat supply network heater (7) is communicated with the second heat supply network heater (8) through a pipeline;
a first steam valve (9) is arranged on a pipeline, wherein a steam outlet of the middle pressure cylinder (3) of the steam turbine is communicated with a power steam inlet of the first ejector (5); a second steam valve (10) is arranged on a pipeline, wherein the steam outlet of the middle pressure cylinder (3) of the steam turbine is communicated with the power steam inlet of the second ejector (6); a third steam valve (11) is arranged on a pipeline, communicated with the first heat supply network heater (7), of the exhaust port of the middle pressure cylinder (3) of the steam turbine;
a first injection steam valve (12) is arranged on a pipeline, wherein a steam outlet of the low-pressure cylinder (4) of the steam turbine is communicated with a low-pressure steam inlet of the first ejector (5); a second injection steam valve (13) is arranged on a pipeline, wherein the outlet of the first ejector (5) is communicated with the low-pressure steam inlet of the second ejector (6);
a first mixed steam valve (14) is arranged on a pipeline between a steam outlet of the first ejector (5) and the outlet of the second ejector (6); a second mixed steam valve (15) is arranged on a pipeline, wherein the outlet of the second ejector (6) is communicated with the second heating network heater (8);
the control method of the cascade energy utilization heating system under the low-load working condition comprises the following steps:
the first step: acquiring an outdoor environment temperature T0;
continuously monitoring the outdoor environment temperature T0 in winter;
and a second step of: presetting four temperature node parameters, wherein the temperature nodes T1 > T2 > T3 > T4;
according to different heat supply areas, four temperature nodes are arranged so as to adjust heat supply temperature in time when the outdoor environment temperature T0 changes, thereby achieving the heat supply requirement of heat users;
thirdly, comparing the outdoor environment temperature T0 with four temperature node parameters to determine a heating mode;
d1: when the outdoor environment temperature T0 is more than or equal to the temperature node T1, the heat supply mode is switched to a mode 1;
the mode 1 is that a first steam valve (9), a second steam valve (10), a third steam valve (11), a first injection steam valve (12), a second injection steam valve (13), a first mixed steam valve (14) and a second mixed steam valve (15) are closed, and meanwhile, a first ejector (5) and a second ejector (6) are closed;
d2: when the outdoor environment temperature T0 is more than or equal to the temperature node T2, the heat supply mode is switched to the mode 2;
the mode 2 is that a first steam valve (9), a first injection steam valve (12), a first mixed steam valve (14), a second mixed steam valve (15) and a first ejector (5) are opened, and a second steam valve (10), a third steam valve (11), a second injection steam valve (13) and a second ejector (6) are closed;
d3: when the outdoor environment temperature T0 is more than or equal to the temperature node T3, the heat supply mode is switched to a mode 3;
the mode 3 is that a first steam valve (9), a second steam valve (10), a first injection steam valve (12), a second injection steam valve (13), a second mixed steam valve (15), a first ejector (5) and a second ejector (6) are opened, and a third steam valve (11) and a first mixed steam valve (14) are closed;
d4: when the outdoor ambient temperature T0 is less than or equal to the temperature node T4, the heat supply mode is switched to a mode 4;
the mode 4 is that a first steam valve (9), a second steam valve (10), a third steam valve (11), a first injection steam valve (12), a second injection steam valve (13), a second mixed steam valve (15), a first ejector (5) and a second ejector (6) are opened, and a first mixed steam valve (14) is closed.
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| CN113464225B (en) * | 2021-07-05 | 2022-06-21 | 西安交通大学 | System and method for wide load operation of power plant with two-stage steam ejector |
| CN115406131B (en) * | 2022-08-31 | 2023-11-28 | 华能国际电力股份有限公司 | Water-heat cogeneration system based on ejector and operation method |
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| CN212362152U (en) * | 2020-08-26 | 2021-01-15 | 普瑞森能源科技（北京）股份有限公司 | Cascade energy utilization heating system under low-load working condition |
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2020
- 2020-08-26 CN CN202010873224.9A patent/CN112050274B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3908994A1 (en) * | 1989-03-18 | 1990-09-20 | Daimler Benz Ag | PASSENGER HEATING, ESPECIALLY BUS HEATING |
| CN105783080A (en) * | 2016-04-19 | 2016-07-20 | 刘子旺 | Hot-pressing unit heat supply system matched with high-back-pressure heat supply of large air-cooled generator set and regulating method |
| CN106989429A (en) * | 2017-05-10 | 2017-07-28 | 程琛 | Exhaust steam of electric power plant waste heat recovery heating system |
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